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Full text of "Hacks and Mods"

Hand-Crank USB Charger 



.1 



Make Projects 



build, hack, tweak, share, discover. 



Hand-Crank USB Charger 

Written By: Rich Reynolds 



TOOLS: 



#0 or #00 Philips Screwdriver (1) 
10 Ohm. 1/8 Watt resistor (1) 
Hot Glue gun & hot glue (1) 
Multimeter or Continuity Tester (1) 
Soldering iron (1) 
USB A/B cable (1) 
Wire stripper/crimper (1) 
Zener diode. 5.1V. 1N4733A (1) 



PARTS: 

hand crank flashlight (1) 



SUMMARY 

I wanted to be able to charge my cell phone, MP3 player, and other USB devices while not 
having plug-in power available. This hand-crank generator, originally designed by Ben Heck , 
ended up working the best. 



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Page 1 of 5 



Hand-Crank USB Charger 



Step 1 — Hand-Crank USB Charger 




• I'm taking a trip to China soon, and 
last summer we spent a week 
without power due to downed trees 
all over the state. Let's just say it 
was a rough week. So I wanted to 
find a way to charge my USB stuff 
without using those battery packs. 
Originally I was thinking of making 
an Altoids can AA battery charger, 
until I stumbled upon Ben Heck's 
video on YouTube. 



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Hand-Crank USB Charger 



Step 2 




• First - RESEARCH. I needed to look up the pin specifications of a USB cord and find a 
USB extension cord. I needed the female end as well as the male end for testing. 

• Second - I hit up Walmart and Harbor Freight for cheap hand-crank flashlights. I ended up 
getting 3 different lights. I got a Gordon crank light ($8), a Gordon LED Dynamo flashlight 
($8 for a 2-pack), and an Energizer hand-crank flashlight ($10). 

• NOTES. Record your findings in your Maker's Notebook. (Shameless plug!) 

• USB Pins - A quick Google search and you can find all this info, but basically on a regular 
USB-A cable you need the red and black wires. 



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Hand-Crank USB Charger 



Step 3 



ben heck crank fia-hli.jli! 



%. DIY Hand Crank Android Charger! - The Ben Heck Show 
' SUBSCRIBE NBW!> Os.jfc,..i* .v»i.u«o - 




• Next was a trip to YouTube and to RadioShack. Ben Heck from Element14.com has a 
video on this exact project. 

• At RadioShack you will need to pick up a 10-ohm resistor as well as a 5V zener diode. 

• I found that the small hand-crank LED light from Harbor Freight worked the best due to the 
fact that it was the only one with a rectifier. Solder your resistor and diode as seen in the 
picture (borrowed from Ben's YouTube channel ). 

• SIDE NOTE - You can actually remove all of the other components (3.6v battery, misc. 
resistors) from the PCB. You only need the rectifier. 



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Hand-Crank USB Charger 



Step 4 




• Finally, solder the red and black 
leads to the rectifier and the 
resistor as shown in the picture in 
the previous step. Plug in your 
phone/i Pod/whatever and crank 
your heart out. 

• Use your multimeter to make sure 
the diode is only putting out 5V (or 
thereabouts). If the voltage is 
higher, you could damage your 
device. 



Check out The Ben Heck Show. A video where I learned about this project can be found here . 



This document was last generated on 2012-11-03 04:15:21 AM. 



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Page 5 of 5